Car roof



March 15, 1932. c. D. oNsALL.

CAR ROOF Filed Sept. 19, 1930 lIlIIII/III/ vio Patented Mar. 15, 1932UNITED STATES MURPHY COMPANY, F NEW PENNSYLVANIA v PATENT.*OFFICEL'iCHARLES nAvIn EoNsAII., Vor PITTSBURGH, `iiENISTSY`I.'vANIA, AsSIciNoE.VTo rf ILU- KENSINGTON, PENNSYLVANIA, A ooEroEATIoN 0E CAE noon1Appueatign. mea september 19,1930. ASei-*iai No. 482,949. l

This inventionrelates to car roofs of the all-steel riveted-up" typewherein thev roofing sheets extend from side plate to side plate of' thecar and are provided with upstanding lianges along their sides, theflanges of adjacent Sheets b-eing rigidly clamped by a seam cover so astogether to function as outside carlines. The'principalobjectof the of.It' also consists in a seam constructionV wherein such a seam cover isriveted to the. upstanding side flanges of the Sheets with a space leftbelow the rivets between such seam cover and said upstanding flanges;and it also consists in the parts and combinations of parts hereinafterdescribed and claimed.

In the accompanying drawings wherein like reference numerals refer tolike parts wherever they occur,

Fig. l is a plan view Vof a solid riveted up roof conforming to myinvention, l

Fig. 2 is a crosssection through a seam thereof at the ridge,

Fig. 3 is a cross sectional view of the plate from which the cap of Fig.2 is formed,

Figs. 4, and 6 are the cross sectional views of modified designs of seamcaps, and l Figs. 4a, 5a and 6a are respectively cross sectional viewsof the plate from which the I caps of' Figs. 4, 5 and 6 are formed.

The roof illustrated in Fig. 1 comprises sheets l that extend fromV sideplate to side plate and have their ends riveted to such side plates 2.rFhe sides of the sheets have raised panels 3 with upstanding flanges 4along their outer edges. The adjacent upstanding flanges of adjacentsheets abut against each other and are covered by a seam cap or cover 5consisting of a plate or heavy sheet rebent on itself longitudinallyandprovided with out-turned horizontal flanges 6 at its margins. Suchseam cover or cap straddles the upstanding flanges 4 of the roof sheetsand is secured thereto by horizontally disposed rivets 7 that extendthrough `both legs'of the Seam cap,whereby the seam cap and the sheetflanges are' clamped'firmly togetherv and 4 constitute, ineflectfanoutsidecarline construction. Y -f l e l Y A. Accordingto thepresent invention, the seam'co'v'er is made of a plate of variousthickness one or more longitudinal'strips'thereof being thicker thanthe-adj acent strips. The

design of plate illustrated in Fig. f3 isrela` tively thick throughoutVits body portion 8 and relatively thin throughout itsside marthatdefine', the relatively thick middle orbody portion froml the relativelythin marginal portions. The thick body portion of this de- .spaces lOintervening between the upstand Ving flangesof the sheets and therespective legs oftheseam cover. By, reason of such spaces,y capillaryaction is preventedand the ,sheets are affordeda'certainleeway formovement, 1n' Case of y great stress thereon. f How'- ever, the blankmay be folded lso that'theolfset H- face isoutermost; in which case",`the marginal ginal portions'Q, one of thefaceshavingoffsets j "sign iswide enough to extend below, butonl'y anV portions may, if desired, bemade thin enough ,l f

toflex kand letthefsheets move. y Y case, the moreY efficientdistribution ofmetal makes it-practicable to reducethe totalweight l lofmetal in the roof *without* sacrificingthc In either Vstrength thereof.Preferably the horizontal 'Y flanges 6'of vthe lseamT cover rest on Itheraised` panel' portions of' the sheets.

1 1 By difiere.tiatingbetwee the thieing'ssf I Y 90,

the body portion-l andthe thickness of fthe marginal .port-ions of4 theseam cover, the

designer of theroof is afforded wide latitude in utilizing hisstructural materials to thel Y v best advantage in comparison withV.theyrestrictions occasioned-by the'use ofsheetjsand plateslfruniformthickness. Forjinstance, it isobviously desirablethat the sheets andseam," i cover shall be so designed as to cooperate in andvarious pinventions 'have been made taking care of the roof load and otherstresses; m0 I l ..59 secured thereto by horizontal rivets, the lowerthisend inview. According tothe present invention, the metal in the seamcover can be massed Where it is most ellicient in Vtaking care ofstresses. l For instance, in the construction illustrated' in Fig. 1,beam action is involved; that is, the roof sheets are adaptedl and.arranged to take care of tensile stress and the portion of the seam capabove the neutral axiswtakes Yca re of compressive stress, and thevjdesigner, having control over -the'eros's sectional shapeandareaof'the's'eam cover, can ad]ust such cross section to the requirementsvof his computations. yIn thisway, hecan mass av considerable amount ofmetal at the4A top of the seamcover,Where'iit is'most"eiii"yciehntinjaction and tends to raise the level of theY neutrall axis and.thusito renderl the sheets moreelicient in takingcare oftensile-stress. j' Figs. 4,. 5 an'd represent various modifications inthe designfof seam cap and. igs. lla, 5d and 6a `represent therespective, plates from. which theyzaremade. The seameap of y Fig.' 4;Vconcentrates v*considerable metal at the top thereof, the eXtrathickness-beingV on the outside ofthe cap and .resulting from* foldingthe platein the opposite'direction to that parallellines at oppositesides nof a thickened iatthe uppermost-part thereof. .Signed at New.Kensington,` Pennsylvania,

plate rebent along a line adjacent to its lon-V gitudinal middle lineand having horizontal flanges along its sides, said seam cover hav- Ying rivet holes through its vertical portions, and the side marginalportions of said seam cap being thinner than the body portions forWidths extending almost to the rivet'holes.

5. ,A seam cover for a car roof comprising a plate rebent along alongitudinal line and having horizont-al flanges alongvits'sides, saidseam cover having rivet-'holes through its vertical portions, andthenppermostpart of said seam cap being thicker than the flangeVportions. I

6. A seam` cap for a car roof comprlslng a Vrebent platevvith horizontalflangeslalong its sides, said seam cap vhaving rivet holes VAthrough itsvertical portion sthe`top ofsuch seam cap and the rivet portions thereofbeing thicker than the portions fbetvvee'nithem andvt thicker than theside marginal 'portions'of vsaid seam-cap.` f l 7. In'a car roof, aseam'construction comprising roof sheets With upstanding flanges and aseam cap stradd-ling said flangesan'dH secured thereto by horizontalrivets, the'cross sectionall shape of said cap being such that there vis considerable concentration of. metal this-13u11 day of september,1930..

Ymerits ofthe first'y designfplus special concenl il' tration-ofmetaljat thetop thereof; The design ofFig.. 6 is similar to that of Fig.2 With I .grooves formed above the rivets to economize -metaL A The`several lmodifications shown in the Vdrawings are intended `to' serveYonly as illustrations ofthe latitude and freedom of' l l .designaffordedby thepresent invention; as n i itis obvious thatthe invention'maybeembodied in other designs of seam cap and used with riveted seamsWhether the margins of Vthey sheets are paneledor not. f. A ,Y

i -What Iolaimis:

1.' Ina car roof, a seam construction comprlsing roof Y sheets' vwithvupstanding flanges and: a seam. cover straddhng said flanges and Y.portions of Vsaid seam cap below'the rivets kv'being thinner-thanthe'upper portion thereof. f

i595 oHARLEs 'DAVID BoNsAnnV 2. In aV carroof,aseamconstruetioncomprising roof sheets with upstanding flanges fand a: seam cap. straddling. said. yflanges and securedv theretobyhorizontal rivets, the up Y ipermost and rivetV portions of. vsaid seamcap Y being thicker than thelower portionthereof'.l

Y. '3. In a car roof, asealm construction Vcomn prisingroof sheetsrwithupstanding. flanges and a seam cover straddlin'g said flanges andsecuredV thereto byl horizontal rivets, the upper yportionsV of saidseam-cap being `thicker I than thelowerportions thereof? `.4.;'Ina carroof, aseamcover comprisinga g .A

